UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Ekco A22

Ed_Dinning · 12th May 2006, 12:15 pm

Hi David, it could be modulation hum. Try adding additional 0.1uF caps on the HT rail to improve the decoupling at HF. Older e-caps can have quite high impedance at RF.
You should also add an X rated cap across the mains input.

HTH Ed

12th May 2006, 12:15 pm	#3
Ed_Dinning Dekatron Join Date: Jan 2004 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 8,194	Re: Ekco A22 - Hum at various points on dial. Huh? Hi David, it could be modulation hum. Try adding additional 0.1uF caps on the HT rail to improve the decoupling at HF. Older e-caps can have quite high impedance at RF. You should also add an X rated cap across the mains input. HTH Ed